A：would have liked 是 would like 的過去式，兩者後面都是接現在式不定詞 (to + 原形動詞)，但前者是表示過去想要做但卻沒有做的情況。這種情況也可以用 「would like + 完成式不定詞 (to + have + P.P.)」或 「wanted + 完成式不定詞」(注意：這裡 want 必須用過去式) 來表示。例如：
- My sister would have liked to study abroad. (我妹妹本來想出國留學 — 但事實上並沒有去)
= My sister would like to have studied abroad.
= My sister wanted to have studied abroad.
所以，問題中的句子是說她本來想去香港度週末，但事實上並沒有去。